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Yes. You can swish them around in a cup with a little tank water. They will thaw in a couple minutes.

Liters to Gallons conversion calculator
"Keeping fish for any period of time doesn't make you experienced if you're doing it wrong. What does, is acknowledging those mistakes and learning from them." ~Aeonflame
"your argument is invalid." ~Mommy1

Agreed - you can put a whole cube (if you buy the cubes - they also come in sheets) into a cup of tank water and pour them in little by little (not the whole thing) - watch the fish finish them and add a little more. I found by the end of the cube, the fish were full & less interested so I never used the whole thing.

Caution: if you end up putting too much in and the fish don't eat them all, it's important to clean the remainder out of the tank - I had higher nitrates for a while and discovered old shrimp in the tubing of my filter - ewwww...: )